The world-recognized number one song is "Für Elise".

"Für Elise", formerly known as "Bagatel in A minor", is an independent piano piece composed by German composer Beethoven in 1810. Beethoven dedicated it to "Alice" as a memorial work. This work was discovered by later generations in 1867 and was later included in the Supplement No. 59 of Volume 25 of "The Complete Works of Beethoven".

When Noel published the sheet music of this piece in Stuttgart, a city in southwestern Germany, in 1867, he mistakenly wrote the original title "To Theresa" as "To Alice". From then on, the piano work began to be widely circulated in the world under the name "Für Elise", but the original name "Für Teresa" was forgotten by people.

Later evaluation:

People like to call "Für Elise" "insignificant music". But this insignificance embodies Beethoven's strong creative concept that reflects his personal style and reflects his unique creative thinking.

The music also has various other unique features, all of which demonstrate Beethoven's consistent rigorous spirit in creation. Therefore, although "Für Elise" is only a short piece with a performance time of only more than 3 minutes, it can also be said to be a condensed body of Beethoven's music creation, which also permeates his spiritual expression.

"Für Elise" is just a piano piece by Beethoven, but the harmony techniques used in it still reflect Beethoven's style as a composer who "connects the past with the future", and it is uncompromising. It embodies Beethoven's consistent creative method and still has an indelible impact on later generations.